Few-cycle THz pulse generation in DSTMS driven by an 8.3-MHz amplified Mamyshev oscillator

Mamyshev oscillators are an emerging class of ultrafast fiber lasers that support exceptionally broadband spectra and few-femtosecond pulse durations, making them well-suited for nonlinear frequency conversion. Despite this potential, THz generation with Mamyshev oscillators has not been demonstrated to date. In this work, we report the generation of THz few-cycle pulses at an 8.3 MHz repetition rate via optical rectification of a 31-fs pulse duration, 1-W average power amplified Mamyshev oscillator in a 190-µm-thick DSTMS organic crystal. We measure a THz average power of 40 µW and a spectral bandwidth of 4 THz. To further investigate the advantages of combining the Mamyshev oscillator and organic crystals for THz generation at a multi-MHz repetition rate, we compare the THz pulses with those generated using a conventional inorganic 500 µm-thick GaP crystal, obtaining comparable bandwidth, but 20 times lower power with respect to DSTMS.